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@ 2015-05-05T14:31:18Z

<?php

$source = json_encode([new StdClass, "This is a test", "Foo's bar", 1, 5]);
var_dump(json_encode($source));
function escapeForJs($string) {
    $len = mb_strlen($string, 'utf8');
    $array = [];
    for ($i = 0; $i < $len; $i++) {
        $array[] = mb_substr($string, $i, 1, 'utf8');
    }
    return implode("", array_map(function($char) {
        if (ctype_alnum($char)) {
            return $char;
        }
        $bytelen = mb_strlen($char, '8bit');
        
        if ($bytelen === 1) {
            return '\\x' . str_pad(dechex(ord($char)), 2, '0', STR_PAD_LEFT);
        }
        $result = '\\u';
        for ($i = 0; $i < $bytelen; $i++) {
            $result .= str_pad(dechex(ord($char[$i])), 2, '0', STR_PAD_LEFT);
        }
        return $result;
    }, $array));
}

var_dump(escapeForJs($source));

Output for git.master, git.master_jit, rfc.property-hooks: string(43) ""[{},\"This is a test\",\"Foo's bar\",1,5]"" string(88) "\x5b\x7b\x7d\x2c\x22This\x20is\x20a\x20test\x22\x2c\x22Foo\x27s\x20bar\x22\x2c1\x2c5\x5d"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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